These are Sherman IIIs:
(Source)
The first (left-most) one is a Fisher-produced M4A2 with driver’s periscopes, the second and third have direct vision (DV) flaps, and judging by the antenna mount, the second one at least is also a Fisher tank; I can’t see it on the third well enough to tell. The second tank is much the same configuration as the Sherman I’m building, the third is earlier (it has return rollers on top of the bogies instead of behind them), while the first tank is of later production than the other two.
Interestingly, I’ve just been browsing the IWM’s collection for photos from Tunisia, 1943 and almost every welded-hull Sherman in the photos has DV flaps. This is the only exception I saw on a quick look:
THE BRITISH ARMY IN TUNISIA 1943 Image: IWM (NA 1574)
But it’s not clear to me if this is a Sherman III or Sherman I.
Be sure to get one of the kits that say they’re “direct vision type”. That would be suitable from El Alamein onward, if you add the British additions to it anyway.